|
|
Technology to remove sulfur oxides (NOx) from flue gases for large combustion plants
Hrubý, Radomír ; Bojanovský, Jiří (referee) ; Jecha, David (advisor)
In the specified large combustion plant, fuel with a large content of sulfur is burned. The current desulfurisation method is not able to meet the new emission limits, therefore it is necessary to design an adequate desulphurisation method. The theoretical part of this diploma thesis contains a description of the legislation related to emission limits for large combustion plants and an analysis of individual technological methods of desulphurization together with a description of the relevant sorbents. The practical part of the work contains a design of dry conditioned sorption with the using of a calcium-based sorbent. The basic technological and structural design is designed together with the spatial solution and dispositional solution of the whole technology.
|
|
| |
|
|
Crankcase Ventilation of the Internal Combustion Engine
Zavadil, Martin ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
This thesis has been written out as a literature review. This work is focused on crankcase ventilation systems of internal combustion engines. The aim was to describe the origin of bow-by in different parts of engine, the principle of operation of individual components and a description of design solution for different types of engines. The work also describes the differences between crankcase ventilation systems of motorcycles and trucks. The last chapter is a description of used design solution of crankcase ventilation system for the selected engine VW 2.0TDI. In conclusion the work outlines possible developments in the field. The work also includes image attachments approaching the issue and design solutions.
|
|
|
Effect of ESP on distribution and chemical composition of particles from biomass combustion
Preisler, Lukáš ; Köbölová, Klaudie (referee) ; Adamec, Vladimír (advisor)
Biomass combustion causes a significant number of particles that, released into the atmosphere, negatively affect human health. Knowledge of the size and composition of the particles is essential for possible flue gas separation by electrostatic precipitation technology. This technology is developed and used in large power plants, but the electrostatic precipitation in domestic boilers is rare. This work describes the methods of fine particle formation and their size distribution and composition. Measurement methods of chemical composition and the size distribution are provided. According to a review, the effect of electrostatic precipitator on size distribution and chemical composition is discussed. In the experimental part, fine particles were sampled from the flue gas of a domestic wood pellet boiler containing an experimental electrostatic precipitator. Due to operational reasons, the electrostatic precipitator did not run during sampling. Flue gas condensed on the inner surface of the flue. The particles were sampled on filters at the beginning and the end of the flue. The filter was analyzed on an electron microscope.
|
|
|
Re-design of biomass boiler for very wet fuel
Zbořil, Martin ; Skála, Zdeněk (referee) ; Lisý, Martin (advisor)
The aim of this thesis is to calculate the stoichiometric balance of boilers and boiler fuel for normal monture to 60%. Determine the monture, content depending on the conditions of the fuel in the combustion chamber and conditions of combustion. Experimental analysis of the current state of the boiler ZKG measurements using this device and propose modifications and solutions.
|
|
|
Fly ash of class C for ceramic technology
Keršnerová, Lucie ; Šveda,, Mikuláš (referee) ; Rovnaníková, Pavla (referee) ; Všianský,, Dalibor (referee) ; Sokolář, Radomír (advisor)
This thesis is focused on the possibilities of the utilization of the fludized fly ash in ceramic technology, especially in the field of brick manufacturing and ceramic tiles. There were used fly ashes from thermal power plants in Hodonín, Ledvice and Tisová. Fluidized fly ash can be used for manufacturing of building materials. There hasn’t been done extensive research in this area. One of the problem is sulphur dioxide leakage during burning. The work describes the behaviour of fluidized ash during firing. The attention is focused on air pollution of sulphur dioxide. The production of SO2 is controlled so that the aim of the work is to find a way how to avoid leaking. It was proved that addition of sodium ions causes the formation of minerals hauyne and nosean during firing. Also is described the behaviour of the fly ash-soil mixtures. The anhydrite decomposition temperature is lower than in pure fly ash. In the end is fluidized ash applied for the production of dry pressed ceramic tiles. This ash can be used in ceramic technology. However, despite the interesting results there are number of problems that need to be solved.
|
|
|
Verification of emission class of solid fuel boilers
Skoupý, Jan ; Štelcl, Otakar (referee) ; Baláš, Marek (advisor)
This thesis is focused on verifying of emission class of solid fuel boilers. The boilers are described from principle of combustion process in the beginning. The second part divide and describe solid fuels which are intended to burn in these boilers. The third part deals with requirements of legislation of the Czech Republic and European Union. The last part verifies this requirements on the selected solid fuel boiler.
|
|
|
Evaluating and modeling of fouling process in heat exchanger
Čirka, Martin ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This diploma thesis discusses fouling processes and mechanisms of industrial heat exchangers, with focus on shell side fouling of heat transfer area by flue gases, and eventually taking fouling into account, or more precisely its modeling and predicting by calculation. Thermal-hydraulic design of heat exchanger is focused mainly on shell side, as flue gases are dominant process medium in terms of fouling and heat transfer. Based on available operational data of evaluated industrial heat exchanger, specific process has been developed to determine by calculation, or more precisely predict change of fouling factor throughout operational period of heat exchanger. Usage and various options of this specific calculation technique are being discussed in conclusion, whether there is a potential to use this technique regarding more complex operational inputs or prediction of fouling process for different operational regime of heat exchanger.
|
|
|
Project and calculation of heat exchanger
Kóša, Štefan ; Lisý, Martin (referee) ; Skála, Zdeněk (advisor)
This master’s thesis is concerned with design of a heat exchanger for a unit with gas turbine. The pressurized air from the compressor is heated with flue gases from gasification and subsequent combustion of wooden biomass. Then it is led to the expansion turbine. For thermal and hydraulic calculations a program named HTRI Xchanger Suite® has been used. The thesis includes a brief description of heat exchangers, description of the used program, calculation and selection of input data, solving and conclusions. It contains also a layout of the exchanger.
|
|
|
Heigh effective condensation boiler feeded by natural gas
Renfus, Jaromír ; Fortelný, Zdeněk (referee) ; Fiedler, Jan (referee) ; Pospíšil, Jiří (advisor)
The dissertation is concerned with a problem of condensing boilers. The attention will apply to the condensing boiler which is filled in an absortion springle for a better an-nealing of exhaust gas. On this account the dissertation is possible to divide by some parts. There is a generally resolution of a condensing boiler´s principle and an effective annealing of exhaust gas for low temperatures in the first part. A description of an ab-sorption circulation follows in the second part. A practical part solves a suggestion of the condensing boiler with an absorption afterheat removal springle, an assesment of working parameters and a calculation of heat transfer surfaces. A technoeconomic ana-lysis of a proposed arrangement is made in the final part.
|
guest ::
